Positioning & Flow
Max Pain
Also called: maximum pain, max pain strike
Max pain is the strike at which the total dollar value of all expiring options is lowest, so option buyers collectively lose the most and option sellers keep the most premium. It is computed from open interest for a single expiration.
For each candidate settlement price, sum the intrinsic value of every open call and put at expiration; the price that minimizes that sum is max pain. The theory is that net sellers of options benefit from settlement near that level and their hedging may nudge price toward it into expiration.
Evidence for a pinning effect is strongest in large-cap names with heavy open interest and on monthly expirations. Max pain is a positioning reference, not a target: it moves as open interest changes, and a strong directional catalyst overrides it easily.
Formula
Max pain = argmin over P of Σ_calls OI × max(P − K, 0) + Σ_puts OI × max(K − P, 0)
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Frequently asked questions
Does the stock always close at max pain?
No. Studies find a mild tendency for prices to drift toward heavy-open-interest strikes near expiration, but it is a probabilistic tilt that weakens whenever news drives the underlying.
How is max pain different from GEX?
Max pain looks only at intrinsic value at expiration. GEX weights positions by gamma, so it describes hedging pressure at every price now, not just the settlement outcome.